JPS6335121Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive displacement fluid machine generally referred to as a C-ring pump or scroll pump.

As this type of fluid machine, for example, the above-mentioned C
Ring-type pumps are known, but in the case of this C-ring type pump, a C-shaped groove is provided on the end face of the case, one end communicating with the inlet and the other end communicating with the outlet. A disk that fits loosely between the inner surfaces of the C-shaped groove from a disk that is attached to the open end surface of the groove, and whose tip surface slides into contact with the bottom surface of the C-shaped groove.
A protruding C-shaped wing is provided at a predetermined distance from the center of curvature of the C-shaped groove so that at least one of the inner circumferential surface and the outer circumferential surface of the C-shaped wing abuts the inner surface of the C-shaped groove. By arranging the C-shaped blades eccentrically by 1 and causing the C-shaped blades to perform a diagonal movement along the eccentric trajectory, the fluid filling the C-shaped groove is moved from the inlet side to the outlet side. and a pump unit configured to obtain. The following explanation will focus on such a C-ring type pump, but according to a fluid machine with such a configuration, a plurality of pump units are connected in series, and the C-shaped blades of these units are mutually connected at a required angle. By allowing the pumps to operate synchronously with different phases, it is possible to construct a positive displacement pump without pulsation. By forcibly operating the C-shaped blades of each of these units and making the operating force available to the outside, it is possible to create flowmeters with low pressure loss and stability over a wide range from high to low speeds. It is possible to construct a motor that operates in the following manner.

By the way, as a specific means for causing the C-shaped blade to perform the above-mentioned wobbling motion, for example, a rotating shaft is disposed at the axial center of the C-shaped groove, and a rotating shaft is attached to the rotating shaft. An eccentric cam that rotates together with the rotating shaft is provided, and this eccentric cam is rotatably fitted into a shaft hole bored in the axial center of the disk so that the disk can perform a constant movement. It is possible that However, if this is only the case, the disk and the C-shaped blade may rotate relative to the C-shaped groove, and there is a risk that an error may occur in the initially set relative position between the C-shaped blade and the C-shaped groove. Therefore, there is a problem in that it is difficult to constantly and stably exhibit the desired performance.

To solve this problem, for example, a guide part having a circular cam surface is provided on the case side, and a guide pin that loosely fits into the guide part is held on the disk, and the guide pin is inserted into the guide part as described above. It is conceivable that the disk is prevented from rotating relative to the case by being guided by a cam surface.
However, in order to arrange such guide portions and guide pins, it is necessary to secure a relatively large space near the back surface of the disk. Therefore, 2
In a type in which a set of units are operated synchronously, the total space required is quite large, making it difficult to make it compact.

The present invention aims to eliminate such problems.

In order to achieve the above-mentioned purpose, the present invention comprises two sets of units.
The two sets of units are placed back to back through a guide plate provided in the case, and this guide plate is provided with a guide part having a circular cam surface, and a guide pin that contacts the cam surface is attached to this guide part. One end of the guide pin is supported by the disk of one unit, and the other end is supported by the disk of the other unit.

Hereinafter, an embodiment in which the present invention is applied to a C-ring type pump will be described with reference to the drawings.

A first pump unit A and a second pump unit B are connected in series. Each pump unit A, B has C on one end surface 1a, 2a of cases 1, 2.
While opening the C-shaped grooves 3 and 4, discs 5 and 6 that are capped on the open end surfaces of the C-shaped grooves 3 and 4 are loosely fitted between the inner surfaces 7 and 8 and 9 and 10 of the C-shaped grooves 3 and 4. In addition, C-shaped wings 15, 16 are integrally provided, the tip surfaces 11, 12 of which slide in liquid-tight contact with the bottom surfaces 13, 14 of the C-shaped grooves 3, 4, and these C-shaped wings 15,
16, at least one of the outer circumferential surfaces 17, 18 and inner circumferential surfaces 19, 20 of the C-shaped blades 15, 16 is
The C-shaped grooves 3 and 4 are arranged eccentrically by a predetermined distance from the center of curvature O so as to abut on the inner surfaces 7, 8, 9, and 10 of the C-shaped grooves, and the C-shaped blades 15 and 16 are It is designed to perform a circular motion along the orbit. The C-shaped grooves 3 and 4 are each 3/4+
It has an α-arc shape, and has one end communicating with the inflow ports 21 and 22, and the other end communicating with the outflow ports 23 and 24. The outflow port 23 of the first pump unit A is connected to the inflow port 22 of the second pump unit B. Further, the C-shaped blade 15,
Reference numeral 16 has a 3/4+α arc shape, and the radius of curvature of the inner surfaces 7 and 9 on the outside of the C-shaped grooves 3 and 4 at a predetermined depth position is r ₁ , and The radius of curvature of the side surfaces 8 and 10 is r ₂ , and the C-shaped blades 15 and 16
Let R be the average radius of curvature of R = (r ₁ +
The shape and dimensions are set so that the relational expression r ₂ )/2 holds true. Then, the C-shaped blades 15 of the first pump unit A and the C-shaped blades 16 of the second pump unit B are caused to synchronously move in a synchronous manner with their phases differing by 90 degrees. .
Note that the scouring motion of the C-shaped blades 15, 16 refers to a state in which each part of the C-shaped blades 15, 16 simultaneously moves to draw a full circle with the same diameter D. corresponds to a value obtained by subtracting the width dimension W of the C-shaped blades 15 and 16 from the width dimension (r ₂ −r ₁ ) of the C-shaped grooves 3 and 4. And in this example,
Both the pump units A and B are arranged back to back with their axes aligned, and each of the C-shaped blades 15, Each of the 16 children is made to perform the Misosuri exercise. Wing actuation mechanism 2
7 and 28 are the rotating shaft 26 and the rotating shaft 26;
Eccentric cams 33, 34 are mounted on the outer periphery of the disks 5, 6 so as to be slidable in directions in which the amount of eccentricity increases or decreases, and are rotatably engaged with the inner peripheries of the shaft holes 31, 32 of the disks 5, 6 via bearings 29, 30. and spring members 35, 36, which bias the eccentric cams 33, 34 in the direction of increasing the amount of eccentricity. Specifically, flat surface portions 37 and 38 are formed parallel to the outer peripheral surface of the rotating shaft 26, and radial grooves 39 and 40 are provided in the cylindrical eccentric cams 33 and 34,
These grooves 39 and 40 and the flat surface portion 3 of the rotating shaft 26
7 and 38 are slidably fitted in the radial direction. Further, the grooves 39 of the eccentric cams 33 and 34,
Spring holding holes 41..., 42... are provided at the ends of the springs 40, and the eccentric cams 33, 34 are held in place by the spring members 35..., 36... stored in the spring holding holes 41..., 42... 3
3 and 34 with respect to the rotating shaft 26 are biased in a direction that increases the amount of eccentricity with respect to the rotating shaft 26. That is, the C-shaped blades 15, 16 are pressed against the inner surfaces 7, 8, 9, 10 of the C-shaped grooves 3, 4 by the biasing forces of the spring members 35, 36, . Further, a guide plate 43 is disposed between the disks 5 and 6 of the pump units A and B. The guide plate 43 has a disk shape with a thick wall portion 43a at the periphery, and the thick wall portion 43a is connected to both the cases 1 and 2.
It is held and fixed in between. This guide plate 43, which is a member on the case 1, 2 side, has a plurality of guide parts 44 having circular cam surfaces 44a on the inner periphery.
... are bored at equal angular intervals in the circumferential direction, and each guide portion 44 is provided on the disk 5, 6 side.
Guide pins 45 are provided to engage with the cam surfaces 44a of the discs and prevent the discs 5 and 6 from rotating relative to the cases 1 and 2, respectively. Each guide pin 45 has a cylindrical shape, and has one end supported on the back surface of one of the disks 5 so as to be able to slide a certain amount in the axial direction, and the other end supported on the back surface of the other disk 6 so as to be able to slide a certain amount in the axial direction. It is supported so that it can slide a certain amount in the direction of the heart. Then, the cam surface 44
The guide portion 4 is adjusted so that the value obtained by subtracting the diameter of the guide pin 45 from the diameter of a corresponds to the diameter D of the scraping motion of the C-shaped blades 15, 16.
4... and the dimensions of the guide pins 45... are set. Further, a backing member is disposed facing each other on the back surface of each of the disks 5, 6, and the disks 5, 6 are placed between the backing member and the disks 5, 6 in a corresponding C.
A spring member 46 that presses in the shape grooves 3 and 4 directions...
are intervening. Specifically, the guide pin 45
A spring member 46 for biasing the two disks 5 and 6 away from each other is housed inside the spring member 46, and one disk 5 is made to play the role of a backing member for the other disk 6, and the other disk is 6
serves as a backing member for one of the disks 5.

If it has such a configuration, the C-shaped blade 15,
The outer peripheral surfaces 17 and 18 of 16 are C at the outer contact part.
In line contact with the outer inner surfaces 7, 9 of the C-shaped grooves 3, 4, the inner circumferential surfaces 19, 20 of the C-shaped wings 15, 16 are in line contact with the inner inner surfaces 8, 9 of the C-shaped grooves 3, 4 at the inner contact portions. 10, the inside of the C-shaped grooves 3, 4 is formed into sickle-shaped spaces 3a, 4a on the inlet side and space 3 on the outlet side by the C-shaped blades 15, 16.
It is divided into 4b and 4b. From this state, when the rotating shaft 26 is rotated in the direction of the arrow X to cause the C-shaped blades 15 and 16 to perform a sliding motion, the outer contact portion and the inner contact portion are moved into the C-shaped grooves 3 and 4, respectively. , along the inner surfaces 7, 8, 9, 10 from the inlet ports 21, 22 side to the outlet ports 23, 24 side, so both spaces 3a, 3b, 4a, 4b also move in the same direction. , these both spaces 3a,
The fluid filling 3b, 4a, 4b flows into the inlet 2
It will be conveyed from the 1, 22 side to the outlet 23, 24 side. In addition, in the process of the C-shaped blades 15 and 16 performing a sliding motion, there is a period when the outer contact portion temporarily disappears (see first pump unit A in FIG. 4) and a period when the inner contact portion temporarily disappears. The period when the pump runs out (see the second pump unit B in FIG. 3) occurs periodically. However, the first pump unit A and the second pump unit B
Since the phases of the scraping motions of the C-shaped blades 15 and 16 are made different so that these timings do not overlap, the inlet 21 of the first pump unit A and the second pump Unit B outlet 2
4 and C-shaped grooves 3 and 4 in a non-resistance state cannot occur even for a moment. Therefore, with such a structure, the fluid sucked from the inflow port 21 passes sequentially through both the C-shaped grooves 3 and 4 and is reliably guided to the outflow port 24. The pump action of successive discharge can be performed without using any valves or the like.

The above-mentioned operation is obtained, but in this fluid machine, the guide portion 44 having the circular cam surface 44a on the case 1, 2 side, that is, on the guide plate 43.
... are provided, and guide pins 45 ... that engage with the cam surfaces 44a ... are provided on the disks 5, 6 side,
Since the disks 5 and 6 are prevented from rotating relative to the cases 1 and 2, the disks 5 and 6 and the C-shaped blades 15 and 16 can accurately perform only the necessary sliding motion. Become. Therefore, it is possible to reliably eliminate the disadvantage that the positions of the C-shaped blades 15 and 16 relative to the C-shaped grooves 3 and 4 are shifted in the circumferential direction and the desired performance is impaired.

Moreover, in this device, the guide portion 44 provided on one guide plate 43 and the guide pin 45 loosely fitted into the guide portion 44 are shared by two sets of units A and B.
Both disks 5 and 6 are prevented from rotating.
Therefore, compared to the case where the guide portion 44 and guide pin 45 are provided for each unit A and B, the number of parts can be reduced and the structure can be simplified, and space can be used effectively. The entire fluid machine can be made compact. In addition, if this is the case, the disks 5 and 6 of both the units A and B are connected to the guide pin 45.
Therefore, both disks 5 and 6 can be operated reliably in synchronization. That is, there is no need for a special connecting member to ensure synchronization between the disks 5 and 6, and from this point of view as well, the structure can be simplified.

The above embodiments are for the case where the fluid machine according to the present invention is used as a pump, but conversely, if the fluid is made to flow through each of the above units, this fluid machine can be used as a flow meter or a motor. It can be used as

Further, as mentioned above, the present invention can also be applied to a spiral pump (scroll pump) or a motor equipped with a unit consisting of a combination of spiral blades and grooves. An example of this spiral fluid machine is shown in Japanese Patent Application Laid-open No. 104609/1983 entitled "Compressor for Compressible Media."

Further, the configuration of the guide section is not limited to the above-mentioned one, and for example, the guide section 4 shown in FIG.
Partial arc-shaped cam surfaces 44a', 44a' may be provided intermittently only at necessary locations, such as 4'.

Further, the guide pin is not limited to a hollow one, but may be a solid one like a guide pin 45' shown in FIG.

Since the present invention has the above-described configuration, it is possible to prevent the C-shaped or spiral-shaped blade from misaligning with respect to the C-shaped or spiral-shaped groove, and to ensure accurate sliding movement of the C-shaped or spiral-shaped blade. Therefore, it is possible to provide a positive displacement fluid machine that can stably exhibit the desired performance.

In addition, the two sets of units are placed back to back so that the guide part and guide pin can be shared, which reduces the number of parts, simplifies the structure, and promotes overall compactness. Effects can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a front sectional view, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is a partial side sectional view, and FIGS. 4 and 5 are diagrams explaining the principle. FIG. 6 is a partial side sectional view showing another embodiment of the present invention. A, B...Unit (pump unit), 1,
2... Case, 3, 4... C-shaped groove, 5, 6... Disc (backing member), 7, 8, 9, 10... Inner surface, 15, 16... C-shaped wing, 17, 18 ...Inner circumferential surface, 19,20...Outer circumferential surface, 21,22...Inflow port, 23,24...Outlet port, 43...Guide plate, 4
4, 44'... Guide portion, 44a, 44a'... Cam surface, 45, 45'... Guide pin.

Claims (1)

[Scope of utility model registration request] A C-shaped or spiral groove is provided on the end face of the case, one end communicating with the inlet and the other end communicating with the outlet. Alternatively, a C-shaped or spiral wing is protrudingly provided which fits loosely between the inner surfaces of the spiral groove and whose tip surface is in close contact with the bottom surface of the C-shaped or spiral groove; At least one of the inner circumferential surface and the outer circumferential surface of the C-shaped or spiral-shaped blade is arranged eccentrically by a predetermined distance from the center of curvature of the C-shaped or spiral-shaped groove so that it abuts the inner surface of the C-shaped or spiral groove. The fluid filling the C-shaped or spiral groove is moved from the inlet side to the outlet side by causing the C-shaped or spiral-shaped blade to perform a sliding motion along its eccentric trajectory. This is a displacement type fluid machine that is equipped with two sets of units configured to enable A guide portion having a cam surface is provided, and a guide pin in contact with the cam surface is loosely fitted into this guide portion, one end of this guide pin is supported by the disk of one unit, and the other end is supported by the disk of the other unit. A positive displacement fluid machine characterized by being supported by a disk.